On Sun, Mar 17, 2019 at 05:34:06PM +0000, Mark Johnston wrote: > Author: markj > Date: Sun Mar 17 17:34:06 2019 > New Revision: 345244 > URL: https://svnweb.freebsd.org/changeset/base/345244 > > Log: > Optimize lseek(SEEK_DATA) on UFS. > > The old implementation, at the VFS layer, would map the entire range of > logical blocks between the starting offset and the first data block > following that offset. With large sparse files this is very > inefficient. The VFS currently doesn't provide an interface to improve > upon the current implementation in a generic way. > > Add ufs_bmap_seekdata(), which uses the obvious algorithm of scanning > indirect blocks to look for data blocks. Use it instead of > vn_bmap_seekhole() to implement SEEK_DATA. > > Reviewed by: kib, mckusick > MFC after: 2 weeks > Sponsored by: The FreeBSD Foundation > Differential Revision: https://reviews.freebsd.org/D19598
This should have been: https://reviews.freebsd.org/D19599 _______________________________________________ svn-src-all@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"
